Crank for machinery



(NO Model.) V

W. H. KAYE.

CRANK POR MACHINERY. No. 397,367. Patented Feb. 5, 1889.

Heinen,

Parr

VWILLIAllI II. KAYE, ()F IVENONAII, NEIV JERSEY.

CRANK FOR MACHINERY.

SPECIFICATION forming part of Letters Patent No. 397,367, dated February5, 1889.

Application filed November l, 1888. Serial No` 289,705. (No model.)

To all whom, t may concern:

Be it known that IVILLIAM lA-I. KAYE, a citizen of the United States,and a resident of IVenonah, Gloucester county, New Jersey, have inventedan Improved Crank for Machinery, of which the following is aspecilication.

rlhe object of my invention is to so construct a crank 'for machinerythat there will be no dead-center point, as in the usual crank; and thisobject I attain in the manner hereinafter set forth, reference boing hadto the accompanying drawings, in Which- Figure l. is a perspective viewof a crank tor machinery constructed in accordance with my invention.Fig. 2 is a i'ace View ot' the same, and Fig. is a similar view showingthe crank-pin in a different position from that shown in Fig.

A is the crank-arm, having the usual opening, ci, for the reception ofthe crank-shaft.

Instead of connecting the crank-pin l; directly to the crank-arm,however, as usual, I connect said crank-pin to a block, IS, the pivot rlof which is offset in respect to a line drawn through the center of thecrank-shaft opening and through the center of the cranlepin.

The block I3 is contained within a reeess,f, in the face of the crank,this recess terminating in shoulders g g, and between the block B andthe shoulder g isinterposed a spring, 71, the opposite ends of which arepreferably let into sockets or recesses in the block and shoulder, asshown in Figs. 2 and The tendency of this spring is to maintain theblock I3 in its normal position-that is to say,with one `face of theblock in contact with the shoulder g, as shown in Fig. 2-the springbeing such that it will not be compressed when the only obstacle to themovement ot the crank is the load due to the work. X' ielding ot' theblock B in the direction of the arrow, Fig. 2, however, is permittedwhen there is more than the normal resistance to the movement of thecrank-arm.

It Will be seen that owing to the offset-ting of the pivot ol' the blockB `in respect to aline drawn through the centers of the crank-shaft andcrank-pin there can never be any deadcenter point in the movement of thecrank, for if the crank-pin occupies such relation to the crank-shaftthat the line of pull is directly through the center of the crank-shaft,as shown in Fig. 2, the crank-pin will, owing to the offset pivot of theblock B, be at liberty to move independently7 of the crank, so as toshift the line of pull, as shown in Fig. 3, and thus cause the crank toturn.

Although it is preferred to use a springinterliosed between the pivotedblock and a bearing on the crank-arm, other means may be employed :forretaining the block in its normal position, ii desired. For instance, aspring coiled around the pivot of the block and cmgaging with the blockand cra'tnk-arm, as shown by dotted lines in Fig. il, maybe employed.

I Iavin g thus described my invention, I claim and desire to secure byLetters Patentl. lhe combination of the crank, the crank pin carried bya block pivoted to the crank at a point ollset in respect to a linebetween the centers ot the crankshaft opening and crank-pin, and aspring acting upon the block to preserve it in its normal position, allsubstantially as speciied.

2. The combination of the cranlearm, the crank-pin carried by a blockpivoted to the crank-arnl at a point otlset in respectto aline betweenthe centers of the crank-shaft opening and crank-pin, and a springinterposed between said pivoted block and a bearing on the crank-arm,all substantially as speci fied.

23. The combination of the crank-arm having a .recessed face, a blockcarrying the crank-pin and pivoted in said recess at a point offset inrespect to a line between, the centers of the crank-shaft opening` andcrankpin, and a spring interposed between said block and a shoulder onthe clank-arm, all substantially as specified.

In testimony whereof I have signed my name to this speci ii cation inthe presence of two sub scribing witnesses. v

WILLIAM H. KAYE. Witnesses:

WILLIAM I). CONNER, HARRY SMITH.

